Are you planning on releasing it on mobile? I think it would fit well (although the three action buttons may need some extra thinking on the phone screen).
The music is really nice. The slow bullet hell with the shield mechanic is very interesting in that it rewards the player for playing closer.
As a negative point, the salvaged parts were difficult to interpret. I guess they are placeholder and I actually needed to read the title screen :). This title screen was a bit cluttered, I would try to rely less on text there. I would also try to make the enemies a bit more different in aspect (although I think that the simplistic look is part of its charm).
Finally, the scan action with the upgrades add a lot of replayability. A very nice job!